Complete Dentures - Function and Stability

Question 1

Denture security is

Which surfaces need to be considered ?

Answer 1

Main concern

Occlusal
Polished
Fitting

Question 2

Stability

Factors affecting stability

Factors to optimise

Answer 2

Ability to resist the forces attempting to displace it in direction other than at right angles to supporting tissues

Size and shape of the residual alveolar ridge

Peripheral seal
Occlusal surface
Polished surface

Question 3

Problems with upper edentulous ridge

Answer 3

Atrophic fibrous ridge
Torus palatinus
Bulbous ridge

Question 4

Peripheral seal - things to consider

Answer 4

Avoid encroaching onto muscle insertions - mylohyoid, buccinator, genioglossus, mentalis

Undertake functional moulding with impressions

Question 5

Occlusal surface - must achieve

Answer 5

Balanced occlusion - even bilateral contact between opposing surfaces in RCP - static relationship

Balanced articulation - even and mutual stability in all lateral and protrusive movements - dynamic relationship

Question 6

Polished surfaces - must achieve

Answer 6

ConCAVE polished surfaces - enables musculature of lips and cheek to stabilise dentures

Removal of undercut on the lingual surface to prevent displacement

Question 7

Neutral zone

and two areas where a neutral zone is found

Answer 7

Site where opposing surfaces exerted by the lips and cheeks and tongue are in balance

• mandibular anterior region - lower lip
• mandibular posterior sextants

Question 8

Technique to identify neutral zone

Answer 8

Heat cure base reg block
set reg rims and remove wax from lower anterior
apply adhesive and replace missing wax with stiff bit of alginate
get patient to make movements with mouth

Question 9

Pre-contact check-record - what is it
Purpose

Surfaces to consider

Answer 9

Re-registering coincidence of RCP and ICP
Ensure occlusal balance

Remove discrepancies which occur as a result of errors during recording of jaw relations

Occlusal
Polished
Fitting

Question 10

How to balance occlusion

Which rule

Answer 10

Use stonebite to identify where it meets
Use articulating paper to identify premature contacts
Using a bur - deepen fossae until contact includes 1st molars
Achieve even contact in lateral excursion

BULL rule - on mandibular deviation - buccal of upper touches lingual of lower

Question 11

Flabby ridge management

Answer 11

Use ZOE in tray - mucostatic - pipe in silicone - mucocompressive all in one